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AtomicDouble (Guava: Google Core Libraries for Java 11.0.1 API)













    






    

    



    
  
    
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com.google.common.util.concurrent

    
Class AtomicDouble
    

    java.lang.Object
  extended by java.lang.Number
      extended by com.google.common.util.concurrent.AtomicDouble

    

    

    All Implemented Interfaces: 
    Serializable
    

    

    

    

    @Beta
public class AtomicDouble
    extends Number
    implements Serializable

    A double value that may be updated atomically. See the java.util.concurrent.atomic package specification for description of the properties of atomic variables. An AtomicDouble is used in applications such as atomic accumulation, and cannot be used as a replacement for a Double. However, this class does extend Number to allow uniform access by tools and utilities that deal with numerically-based classes.

    This class compares primitive double values in methods such as compareAndSet(double, double) by comparing their bitwise representation using Double.doubleToRawLongBits(double), which differs from both the primitive double == operator and from Double.equals(java.lang.Object), as if implemented by: 

     static boolean bitEquals(double x, double y) {
   long xBits = Double.doubleToRawLongBits(x);
   long yBits = Double.doubleToRawLongBits(y);
   return xBits == yBits;
 }

    It is possible to write a more scalable updater, at the cost of giving up strict atomicity. See for example and .

    Since:
    11.0
    Author:
    Doug Lea, Martin Buchholz
    See Also:
    Serialized Form

    Constructor Summary
    AtomicDouble()
              Creates a new AtomicDouble with initial value 0.0.
    AtomicDouble(double initialValue)
              Creates a new AtomicDouble with the given initial value.
     
    Method Summary
     double addAndGet(double delta)
              Atomically adds the given value to the current value.
     boolean compareAndSet(double expect, double update)
              Atomically sets the value to the given updated value if the current value is bitwise equal to the expected value.
     double doubleValue()
              Returns the value of this AtomicDouble as a double.
     float floatValue()
              Returns the value of this AtomicDouble as a float after a narrowing primitive conversion.
     double get()
              Gets the current value.
     double getAndAdd(double delta)
              Atomically adds the given value to the current value.
     double getAndSet(double newValue)
              Atomically sets to the given value and returns the old value.
     int intValue()
              Returns the value of this AtomicDouble as an int after a narrowing primitive conversion.
     void lazySet(double newValue)
              Eventually sets to the given value.
     long longValue()
              Returns the value of this AtomicDouble as a long after a narrowing primitive conversion.
     void set(double newValue)
              Sets to the given value.
     String toString()
              Returns the String representation of the current value.
     boolean weakCompareAndSet(double expect, double update)
              Atomically sets the value to the given updated value if the current value is bitwise equal to the expected value.
     
    Methods inherited from class java.lang.Number
    byteValue, shortValue
     
    Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
     

    Constructor Detail

    AtomicDouble

    public AtomicDouble(double initialValue)
    Creates a new AtomicDouble with the given initial value.

    Parameters:
    initialValue - the initial value

    AtomicDouble

    public AtomicDouble()
    Creates a new AtomicDouble with initial value 0.0.

    Method Detail

    get

    public final double get()
    Gets the current value.

    Returns:
    the current value

    set

    public final void set(double newValue)
    Sets to the given value.

    Parameters:
    newValue - the new value

    lazySet

    public final void lazySet(double newValue)
    Eventually sets to the given value.

    Parameters:
    newValue - the new value

    getAndSet

    public final double getAndSet(double newValue)
    Atomically sets to the given value and returns the old value.

    Parameters:
    newValue - the new value
    Returns:
    the previous value

    compareAndSet

    public final boolean compareAndSet(double expect,
                                   double update)
    Atomically sets the value to the given updated value if the current value is bitwise equal to the expected value.

    Parameters:
    expect - the expected value
    update - the new value
    Returns:
    true if successful. False return indicates that the actual value was not bitwise equal to the expected value.

    weakCompareAndSet

    public final boolean weakCompareAndSet(double expect,
                                       double update)
    Atomically sets the value to the given updated value if the current value is bitwise equal to the expected value.

    May fail spuriously and does not provide ordering guarantees, so is only rarely an appropriate alternative to compareAndSet.

    Parameters:
    expect - the expected value
    update - the new value
    Returns:
    true if successful

    getAndAdd

    public final double getAndAdd(double delta)
    Atomically adds the given value to the current value.

    Parameters:
    delta - the value to add
    Returns:
    the previous value

    addAndGet

    public final double addAndGet(double delta)
    Atomically adds the given value to the current value.

    Parameters:
    delta - the value to add
    Returns:
    the updated value

    toString

    public String toString()
    Returns the String representation of the current value.

    Overrides:
    toString in class Object
    Returns:
    the String representation of the current value

    intValue

    public int intValue()
    Returns the value of this AtomicDouble as an int after a narrowing primitive conversion.

    Specified by:
    intValue in class Number

    longValue

    public long longValue()
    Returns the value of this AtomicDouble as a long after a narrowing primitive conversion.

    Specified by:
    longValue in class Number

    floatValue

    public float floatValue()
    Returns the value of this AtomicDouble as a float after a narrowing primitive conversion.

    Specified by:
    floatValue in class Number

    doubleValue

    public double doubleValue()
    Returns the value of this AtomicDouble as a double.

    Specified by:
    doubleValue in class Number
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